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# Science Mid- term

Question | Answer |
---|---|

Name two common reference points | Building, terr, etc. |

_____ is defined when an object's distance from another is changing | Motion |

What is the formula for speed | Speed= distance/ time |

If a boat traveled 500 meters in 25 seconds what is its average speed | Average speed= 500/25= 20m/sec |

What is the difference between speed and velocity | velocity is speed with a direction |

Draw a graph with a constant speed | |

Draw a graph that shows constant speed | |

Define force | A push or a pull |

If a golf cart traveled 200 yards in 5 seconds. What is its average speed | Average speed = total distance/ total time |

The rate at which an object is moving at a given instant is... | instantaneous speed |

A distance-time graph indicates that an object moves 300m in 15 seconds and then remains at rest for 15 seconds. What is the average speed of the object? | 300m/ (15+15 sec) = 300m/ 30 sec = 10 m/sec |

What does the graph indicate | changes in speed |

___________ is defined as total distance/ total time | average speed |

A newton is used to measure | force |

An upward force of 750 N is applied to a box weighing 80 N. Draw a vector diagram to represent this situation | |

Draw a picture with a balance force using 40 N. | |

A ________ force allows an object to move | unbalanced |

The following picture represents an unbalanced force what is the net force? | 55N right |

A trip is taken form Columbus to Cincinnati. The trip takes 2 hours and covers approximately 120 miles. What is the velocity of the car trip? | 120 miles/ 2 hours= 60 miles/hour south |

Explain why a biker has to pedal harder to travel at a constant speed into the wind on a windy day compared to traveling on the same road at the same speed on a calm day? | Wind resistance is a force that slows something in motion. |

The motion graph above also shows the motion of a jogger on a run one day. The line is divided into segments. The middle segment is horizontal. What does that tell you about the jogger’s progress between minute 6 and minute 8? | the jogger is at rest |

what was the joggers average speed for the entire trip | 1200 (m)/15 (min) = 80 m/min |

The motion graph above graphs the motion of a jogger on a run one day. How far did the jogger run in 15 minutes? | 1400m |

What was the speed of the jogger above | 1400 (m)/15 (min) = 93.3 m/min |

The reason that water doesn’t fall out of the bucket when I swung it around is because of this force. | Centripetal force or the inward and outward forces are balanced |

What is the average speed of a person who travels 3600 meters in 3 hours and rest for 1 hour and travels for another two hours? | 3600 (m) / (3+1+ 2) = 3600(m)/ 6 hours = 600 m/ hr |

What is the average speed of the object form t = 2 to t= 5 ? Time (s) Distance (m) 0 0 1 1 2 4 3 6 4 8 5 10 6 10 7 16 | 10 - 4 = 6 (distance) 5 - 2 = 3 (time) 6/ 3 = 2 m/s |

Time (s) Distance (m) 0 0 1 1 2 4 3 6 4 8 5 10 6 10 7 16 Using the table above: Did the object travel at a constant speed during 2-5 seconds? Show work | Yes because each of the speeds are 2m/s 4/2 =2m/s 6/3 = 2m/s 8/4= 2m/s 10/5 = 2m/s |

Did the object travel at a constant speed during 0-7 seconds? Time (s) Distance (m) 0 0 1 1 2 4 3 6 4 8 5 10 6 10 7 16 | NO because using the above speeds are 2m/s and at time 1 the speed is 1/1 = 1m/s = changing speeds |

Where is the object at rest? Time (s) Distance (m) 0 0 1 1 2 4 3 6 4 8 5 10 6 10 7 16 | 6sec |

Describe the potential and kinetic energy levels when throwing a ball up in the air and catching in. (Include a picture). | |

A leaf is free-falling from a tree. Draw A free-body diagram for this situation | |

A skydiver is descending with a constant velocity. Consider air resistance. A free-body diagram for this situation looks like this | |

A girl is suspended motionless from gymnastic rings which hangs from the ceiling by two ropes. A free-body diagram for the girl in this situation looks like this | |

Adrianne runs and flings a dodge ball at Lindsay. She thinks if she increased her speed, then the inertia is greater. Lindsay argues that inertia does not depend upon speed, but rather upon mass. Who is correct and why? | Lindsay is correct. Inertia and Momentum are not the same thing. It is possible for something to be stationary (not in motion, less speed) and still have lots of inertia. Inertia: the resistance an object has to a change in its state of motion. |

In space, if you throw a rock where you are far from gravity and friction, what will happen to the rock? Why? | It will continue in motion in the same direction at constant speed until acted on by an outside force. WHY: because of inertia Inertia: the resistance an object has to a change in its state of motion. |

What is the formula for GPE | GPE = gravity x mass x height |

What is the formula for KE | KE = ½ mass x speed² |

What is the formula for gravity | Formula F(g) = m₁ x m₂/ d² |

Gravitational potential energy is... | Gravitational potential energy is the energy stored in an object as the result of its vertical position or height. The energy is stored as the result of the gravitational attraction of the Earth for the object |

f a rubber band has a stretch of 0.1 m pas equilibrium and a spring constant of 40, what is the elastic PE | E = 0.5 * 40 * (0.1)² = 20 * .01 = 0.2 joules (J) |

what is the formula for elastic potential energy | .5kx-stretch past equalibrim |

Created by:
Emma_Bale